Lac-Saint-Jean-Est County Lake Quality
Québec, 16 lakes, average grade A (Excellent)
There are 16 graded lakes in Lac-Saint-Jean-Est County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county's average grade is A — among the cleanest in Québec. 10 lakes pull an A on their own, and almost none fall into the D or F brackets.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Lac ÉLie-Gagnon (A); the most-stressed is Lac Noir (B).
Quick Answers for Lac-Saint-Jean-Est County
Planning a trip? Check special fishing regulations for Lac ÉLie-Gagnon — or check the official Québec fishing regulations.
All Lakes in Lac-Saint-Jean-Est County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac ÉLie-Gagnon | A | 16.6 ft | 2.6 µg/L |
| 2 | Lac Richard | A | 31.5 ft | 3.5 µg/L |
| 3 | Lac à Ludovic-Gauthier | A | 21.5 ft | 3.8 µg/L |
| 4 | Petits Lacs Bleus | A | 17.9 ft | 2.6 µg/L |
| 5 | Lac de L'Aqueduc de Saint-Bruno | A | 15.1 ft | 5.2 µg/L |
| 6 | Lac Louvier | A | 14.6 ft | 3.2 µg/L |
| 7 | Lac Garnier | A | 11.8 ft | 5.1 µg/L |
| 8 | Petits Lacs Bleus | A | 13.5 ft | 4.5 µg/L |
| 9 | Lac à la Carpe | A | 12.1 ft | 7.6 µg/L |
| 10 | Lac Vert | A | 13.5 ft | 8.6 µg/L |
| 11 | Lac Labrecque | B | 7.7 ft | 6.8 µg/L |
| 12 | Grand Lac Sec | B | 8.7 ft | 13 µg/L |
| 13 | Lac des Habitants | B | 9 ft | 9.1 µg/L |
| 14 | Lac RéMi | B | 6.6 ft | 7.2 µg/L |
| 15 | Lac Gamelin | B | 11.8 ft | - |
| 16 | Lac Noir | B | 4.8 ft | 9.5 µg/L |
Other Counties in Québec
See how Lac-Saint-Jean-Est County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
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Source: EPA National Aquatic Resource Surveys, 2026.